Modelling the discontinuous coarsening reaction in lamellar eutectic alloys

Full text.Previous experimental studies have shown that the discontinuous coarsening reaction talking place at grain boundaries within a eutectic lamellar microstructure depends on the alloy's initial growth rate. For as-cast microstructures, the grain boundary migration was observed to take place after the first hours of isothermal annealing. For as uni directionally grown microstructures, the grain boundary could remain perfectly stable, after many hours of isothermal annealing. A modelling of the discontinuous coarsening reaction with the phase field method is carried out in the present paper. The method, based on phenomenological equations of Ginzburg-Landau type, constitute a powerful tool for numerical simulations of interface dynamics in two and three dimensions. The priming of the reaction and its dependence on the alloy's initial growth according to the available results in the literature